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N in (-oo:+oo)
N/18 = 6/8 // - 6/8
N/18-(6/8) = 0
N/18-3/4 = 0
1/18*N-3/4 = 0 // + 3/4
1/18*N = 3/4 // : 1/18
N = 3/4/1/18
N = 27/2
N = 27/2
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